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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ef94eea48bcc893bdd561db4088455b2ed6244a6a1c04a752ce1bf60bc17bcf' 
  AND token = 'Pzgggl/n/ULsNDhhxcP13OfThY0TYp3mySzAaelmldE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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