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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6c402fab443ad9c287f2aebbb95b64f3d16f85c44d6672d602d1e15d9eeae5d' 
  AND token = '2HReTGhGRfNaNW4APQbRotcPIIb2BQVdlB8UomSmQ+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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