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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f5d030d442052f84f9799a0000e1b519c4a5ea3e9201cd56b24f1446bb43e08' 
  AND token = '3ncTZsGzERdhn6p4AMjSTRROezzaI5g2CQSZDGwAaRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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