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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5de033e961d8ddebc6fb7954940cfa3fe840ed3443e99ab7e64a304a93dc8405' 
  AND token = '1byGPbr47mMYgm1/2vv89HPcvjcv8eQzJUJIduzyN2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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