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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38a8c2b747dde10250cb6c0e6e7d1111d01961e93b1e28060300b603fa91f558' 
  AND token = 'u2VU6eZYtDFZCpQUXaNQ6PSqRxODSreTJK/EzCCgs18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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