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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec63550e494aae00348e833efde847f71e036deed92d1314914c00e39a358efc' 
  AND token = '8XkrL5M4NlWuVSmb+3PuLEuYNAVnjgupfgm6N+1OioM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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