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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '442e576ac884a6579843fd2f614247cea9da7bcc8a4dfbb16457f6a1d2232f89' 
  AND token = 'g0CToBKdLgOsOKkr8glJDDtPrqn1DoyPMU2yXwwNj8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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