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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '170f3bd99be73958d97dd714807cc7a26fece43b838465c3cdea0a82a00f6be9' 
  AND token = '6eo3sj40KoVjlAfmi4qo8dIk60VyWllZLb+yT1DZvJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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