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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c896fd8708e41dd40e7155eacfcf9532ccd0c76fec8daa8d6a0303abbe0f41d' 
  AND token = 'fZl5gXBPt/zrcJyZVWKiWBzef5nw3z7xAZPCLUMMv+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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