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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bd43d01c8968c043fefc814f41e26c6c5c54f424bdb69540872a8febdf9ef6f' 
  AND token = 'MXWU7YW/QAX0TnfPKdkrdRuq5TsH5GZ0bKLC2/43J+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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