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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f602fc0a083d5a619d18d8ca4638f823441aebda7817e0d7b5a6fbd880ca3837' 
  AND token = '442cWAPuqurrz2l01seung82zjseHmXf7btu5NtWmhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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