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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd462a0b48586faa03bc22afb3c07234423e9f4ed9e5ec151b802042f0859a0c9' 
  AND token = '+bT4AqcdUl4evovv2vj5mdDHErYrSOb/JyNUBx0HWkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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