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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0a5dcfdf9785f00dc52eb308268b70b89fcc36dd3a93ca3524cff6f0d7d4467' 
  AND token = 'm+xzJ0n9G6W1mS4D7xEVYbwHMXvmWasHMVYbfSaIpx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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