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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dee95616a6f0965e6da36074c1182d04bfac2a6c8014082b54881b0f67a7edd4' 
  AND token = '/22BD6CsDfXPZDNFjqcHnJ7OyhwjsmHamSpUj4xMDNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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