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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4b108a0ab048ea17d7a945756d614bcacbbeca4886431903a1d47a25e5dd31d' 
  AND token = 'cO8RN7ALLDWV4imZW7fPLAscnaLYr5f2HFXrVAnsdIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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