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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f88aa5e82f5eef49fa07da562ca160bf714bb8ffce040f5ad86b7aafca25b90' 
  AND token = 'E80fhQK1GVGRe6kcYds7pA1LrPrT9WJmUUCwRN9LbM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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