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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '865368bd1d0234908a63b0eb865a45ab49de197fc0930e6c406f7f00d8b54374' 
  AND token = 'BjE2XXKtc5wzdK8lTo5lYrh4m3RCHMtFRFnViUeeY08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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