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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f25f916baf9c0871ecbd03d5ea45d2b455ca981e0dcb7f02f7d3d74aa1c7f6dc' 
  AND token = '896rVqsTyHHKg/i24GwioXmAMalgAJI9N/reeAPizk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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