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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa927b9a9cca7d821a888271272e8cd946855c9dff21459162956e80f285aace' 
  AND token = 'EC1ToMdcy90mDHknm0Fwh+vqBpqyW9+65/9IJ0wgxyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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