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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2176c293919198e2f535537b6663192a5a63033eefb357d288fe64a6c22fe249' 
  AND token = 'jI0aaeYbv/Yob+Jsbw8w1X7oSAQ1OEBp1npUmAL+x58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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