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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16d9e79066533a3086c64ceb0cb7c97672e86749768dd7f36520f3c2aa7abded' 
  AND token = 'ITrmR2tKa9U5HWnviTqALkHl/s2uRIstg14yS2VpsI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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