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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38b40b08c339d4526fbcd6f08349060b42c9c0b6cf11dea0a0f28953af2d3cea' 
  AND token = 'HMb25HzG+mB47WcOfZ+vyPtfdE263BYrE5VUKadt618=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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