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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1108b8af3f5c83a5d4da3a88d8a05ced939a9edccb314169c1bad2e21c64150c' 
  AND token = '7EVeQWwjhMt9AcKp1R3aT2z8QgiSv0DfC2aKcNaeRss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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