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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c854150d3af2cdbb4c9fc1218c9df6cbc07d2a05afafdf079a7a48c3040cd5e6' 
  AND token = 'Qy01DB0kflpnWKDWqv8W1swDQ3RK7P09hkmQV2awOFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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