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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e99983f8857658327fd503422d6cce22876a4a63496af2d89dbbd7d884b1c58' 
  AND token = 'vZMW8C/2liQW9FhF+WoE8VFc1KVOHSEM473jOHeuuqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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