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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a92772c5e84b328b25a048946138ad9f3010c1786a9a94a4f225c2197519d71f' 
  AND token = 'HjjN9HIg+b/s5nhfG0xdwLtOKyOgvQ+5IIj5Ndf8sqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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