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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2a707264ea3410ae3e2e9506b286c1b47d56b8d58ccae76d251b504d902fa88' 
  AND token = '9ZpwW4IEBp97CI0fx5PKGtUlfrQzHeygr9cLBp8JEh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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