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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d2c0674f0212a8f3be88d5fef6b91fcaee38c0a7490355d8d2f110e211c9d6d' 
  AND token = '/TXMJBFZJiW2iKxWy0v6FVy8AHnmz6Hi6cYK60YdvSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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