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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b7cc37f3ebb35f5f9ec23872a4b91852fcc744e938d466e4044343ba94f8739' 
  AND token = 'g6frf5lM4UK+cjtncRtXizevK5QmfrX7//Z8rfMflaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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