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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9930b0d324c1e3de6cda0825d24a4b1e2ade1d0d1a59acacffb1e052b34f9f10' 
  AND token = '91I4d4+rXlt9lppai+hzSUo4pmbmlOQnANeuq/j6uMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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