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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a33e5f4252ef83980dc1086cf947561063dc3204d1a0ad626d20dfa6e615d85d' 
  AND token = '9EE9p7cFR6zUunXSMrFRaTU4vttSjluXp9qhy8YpQ5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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