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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94ca5b09d055e76780ac53a1d75ccbad2e11ceede96dc6da49df1d1968022e44' 
  AND token = 'YxkT+zsvcHq/hCHVl4fXorgbzu1z4rHTyiF2LKGmkeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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