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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '942b63b1689548f0b276650fcd9b47e809d20bfc1d15d3462c85209c7a422b0c' 
  AND token = 'rxnSRpS7SzQziveRL7uYELeuDgJqxNQhFNhNh41I1IY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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