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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3842bbf728a9863c383b1ca09d8a5c2ced941a1a56e9f00954326d5819aa3caa' 
  AND token = '/p/Y01a4O8L2ycHIlQW98X+8gw6NbY8aiEHeBcXvBBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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