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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '576e564b128c17734fc73caef4304d15bd90b4910ba1af10fab2fac933bc97a7' 
  AND token = '2PwRjOEPeG/KYwry70AuW2ab697yTJ5Jd0Cobp2ajh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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