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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11c4f42fa843578522482289e43ba5a84f2e5353467166d5bcd15977ea38bdc4' 
  AND token = 'yJYtHO6hxHNHD1uUHBWsGDYxy/UvOe1CuCFKO56RR+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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