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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd45708c0739a7b01276f673b9f6ff57656fa4e81d9b03e2cea0e10323627383' 
  AND token = 'n/HGZi7o5YvocUkPSfZLytwo9mnVXSAVKHReNTrws4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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