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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd1c9b77e9f750067359355c378b2ddac664b496616938d3e59af65dfea367ae' 
  AND token = '5ERZJsN3SzP5Ie44hREhCuupNhvKkjzEbvu3+vfGMqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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