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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e86f35da909f4d1e4865198356b640af1c4e2da7facdca055724a246156feeec' 
  AND token = 'dvEZn2N+aNGAA3ejQjj7TfkLkH6XhYG6hsAWMi9bBNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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