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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64b8916fad8639709018a74feb6c56f3e6eb64560ad9a341558225ef9a5e308b' 
  AND token = 'uX681C7MQ3G2GxwLOuwIXO95Hx6Q1YdMPjNVeSJK4mU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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