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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7732fd2111bd9c7e0ee609981f9b0d419956a31cfb4215ab6b0d7490084b0521' 
  AND token = 'nhMs9NgT5NmbZJ637jXPx5Oj9LDZ6AwrYJgXzn7Ddso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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