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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b2671e0eaa7aded56dbe8533bcf94e86d80cee4a237e7fa3cf3cabfc64dbb68' 
  AND token = 'hpZZJiyf76CgqG+TAU/85lahD0l4xovTjdahF4iw6Yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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