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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '517575aa879b4edb87d5eaad7ea4026d131dbea18ed6b358d02183cdbd53afd7' 
  AND token = 'm2Xyzi+JP+2qbP82FUw9gA1ehnMh33CnJfwpz7iEiI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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