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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '064433cdf98d6ab35ca12d1b983e95ba174cdef6f36ee3b24c99723e88d86489' 
  AND token = 'DG6MuMYjpY6AShnGOs3Z76419B4sEQnccg0fqu/A+ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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