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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97c943bbb2a74e172c0d3abb2445ca09a8b773e78460dd4d74db0cd40b3af269' 
  AND token = 'eREnUGDXx8EmrQN1U2hSeUSRyJ0I+2nzKKriBVbu+PU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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