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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '031d2d972c31eafe3f394985f17a858625a90fa7e2472c3fc6e6ff1acc882681' 
  AND token = 'Jg4KThAhhlwfWRg/CIFNb9y97+uD2kXRbhW9yE2iJkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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