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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc66b3741775a64c9a9435719624f3ea9a39852dbd75f3029948eff141c43f81' 
  AND token = 'qXj2U5rGPt9XRJlc43+/Hj6cvgPUd0tqDUsk0JSnTdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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