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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f06d6a2eadf7a3fe8f4ff9abff6933f13c09edb5a6b603e71d0cac7b48cb2f95' 
  AND token = 'vwXBFgggrfv/BettAHADes7m7QU0Qz7AVtRK/RPLxPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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