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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e254cee8407233aa85ec3cb97ddee76b302a3088badb7cd08af342512d08f83' 
  AND token = 'MlGFYEoEQ+F48dkIDdWcfJeeieVNrZ5Wdz7O5GHQ7mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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