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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6656ba126927a82a47d91c0f8d84228c6741241378d9c6c21127a2419459008c' 
  AND token = 'eK/V4n8MSUKYhCK/lvER6UOBPc01l/4iu0eY4krQ6WQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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