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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcaff8581ea16ba8c6edfc3ad4777174ba4c557a1466fb7c0b07052aed367f1b' 
  AND token = '4wDsiHHyBk57ORQ6+EhXxajPbJvtpRMyOGnGpE74PGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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