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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb0f0f5e948b8985f12c078c03e427c9dc45b180dea2cf97223552b00d65aeaa' 
  AND token = 'MY9Damc6avctKgOQdKlifOf5ra6T+wUS3uA6tRph0Po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00092

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}