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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78ee7faaef66ed42cc707a0db6e339b6245fd20884974e2b23f6e2a1751bb162' 
  AND token = 'Ps/lr9mUxdl7/7pLxhg2c3+yrfwikKnse0Y267GUBNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00150

JSON explain

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