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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d566db55fe5fd8d5c9202413dcbc94f0623014770f7be14e6950a0f27b407bc' 
  AND token = 'GhfSBltj2UtCmxQkYyRA0MXz+1iThRyr1k/bEXyxuNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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